Neering



A. G. KINYUN.

DEVICE FUR AERATING POWDERED FUEL APPLICATION man ma; A1. um,

UNTED STATES PATENT FFYLCE.

ALONZO G. KINYON, OF CHICAGO, ILLInoIs 'AssIGNo'n 'ro Pownnnnn COALENGI- NEERING a EQUIPMENT COMPANY, or CHICAGO, ILLINOIS, A CORPORATIONOF DELAWARE. i

DEVICE ron AERATING Pownnnnn FUEL.

Specification 0f Letter Patent Patented June 24, i919.

Application led December 4, i917. Serial No. 205,395.

To (dl whom. 'it may concern:

Beit known that I, ALONZO Gr.l KINYON, a citizen of the United States,residing at Chicago. in the county of Cook and State of Illinois,` haveinvented certain new and useful improvements in Devices for AeratingPowdered F nel, 'of which the following is a specification.

In devices of the character to which my invention relates it is the aimand purpose to separate as far as possi-ble each of the finely dividedparticles of fuel from the others, surround it completely with airsufiicient in quantity for its combustion and support it-in the airuntil it emerges from the burner wherethe mixture of fuel and air israised to atemperature at which combustion takes place. The purpose ofnii/,invention is to provide means` by which vthis aeration of the fueland the supply of particles with air necessary for its perfectcombustion is more efectively accomplished than in the devices of theprior art.

In the accompanying drawings l have shown and in the followingspecification described in detail the preferred form of my invention. Itis to be understood, however, that the specific disclosure is for thepurpose of exempliication only, the scope of the invention being definedin the following claims, in which I have endeavoredto dis tinguishitfrom the priorl art so far as known to me without, however,relinquishing or abandoning any portion or feature thereof.

Referring to the drawings Figure 1 is a side elevation of a deviceembodying my invention with a portion of the wall of a furnace to whichit is applied shown in section; Fig. 2 is a vertical section on anenlarged scale of said device; Fig. 3 a transverse section on anenlarged scale on the line 3-3 of Fig.. 2; F ig` 4 a longitudinalvertical section on the line 4 4 of Fig, 3; Fig. 5 an elevationof adetail; Fig. 6 a transverse vertical section enlarged on the'line 6 -6-of Fig. 2; Fig. 7 an enlarged transverse section on the line 7-7 of Fig.2; and Fig. 8 a detail elevation of the same part.

Referring to Fig'. l -the furnace wall -9 is formed with a burnervopening 10 to which a conduit 11 leads from my improvedaerating device.The aerating Adevice proper Is shown at 12 and receives. finely powderedlopening into the bottoni thereof at 1S. The

coal .or other powdered fuel is fed through the conduit 17 by a screwconveyor 19 which also forms a means for supplying a certain proportionof the air to be mixed with the y fuel, being made .hollow for thispurpose. Conveyor 19 extends beyond conduit 17 in which it is packed at20 and the, conveyer is rotated by means of a beveled pinion 2l thereondriven from a jack shaft 22 which may be rotated b v any suitable motorand transmits motion to the fan by belt pulleys 23, 24 and holt 25.

As heretofore stated the tubular screw conveyer 19 is providedfwith aworm only for'that portion thereof within the conduit 17, but isextended beyond the conduit into the mixing chamber where it isperforated and provided with burs, teeth oi' pro3ect1ons which serve toagitato the mixture of an' and fuel in the mixing chamber and more thoroughly intermingle 'the same. The perforations 26 immediately adjacentthe end of the screw port-ion of the tubular conveyerl are substantiallyperpendicular to the axis of the tube, but the perforations beyond areinclinedwith reference to said axis in a direction to project the air inseries of jets inclined outwardly with respect to said conveyer andforwardly toward the burner. The construction will be best understood byreference to Figs. 3, 4 and 5 in which the inclined openings 27 areshown arranged in circular series and each providcdwith a bur or blade28 correspondingly inclined. The end 29 of the conveyer may he'perforated as at 30 for the purpose of propelling iets of air to directthe mixture toward the burner. A further supply of air is'provided' hysurrounding the mixing chamber with an annular air chamber 31 whichreceives its supply from the fan by the by-pass 32.v Communicationbetween the annular air chamher andthe mixing chamber is provided bystriking up from the metal wall of the mixing chamber inwardlyprojecting tongues 33 leaving openings 34 in said Wall.

In operation the coal `is fed orwardiy in the conduit 17 by the screwconveyer 19 until -it reaches the mixing chamber where it is impingedupon by the radial jets issuing through the openings 26 in the tubularconduit, the air being supplied by the fanas previously described. T heair mixes with the powdered fuel which is then carried on toward. theburner and past the inclined iet openings in the eonveyer, constantlyreceiving additional supplies of air. The inclined forwardly directedopenings cause a constant suction and movement of the mixtum of fuel andair toward the burner. Not only is the fuel supplied with additional airthrough the openings 27 in the conveyer, but also receives supplies ofair from the annular chamber through the openings 34:, the blades ortongues'33 of which also have the effect of directing the entering airforwardly toward the burner as well as inwardly. The blades or tongues33 and the teeth or burs Q8 having relative rotary motion serve to cutand break up the streams of mixed air and fuel moving toward the burner,effectually preventing any massing together of the particles of coal andinsuring the segregation of the individual particles andthe surroundingthereof with an envelop of air of combustion.

I claim:

1. In a device of the class described, an elongated mixing chamber', aconduit connected to one end thereof, a hopper opening into saidconduit, a. tubular conveyer in sai conduit and mixing chamber, saidconveyer having a Worm in said conduit and perforated in the mixingchamber, teeth on said conveyer in the mixing chamber, means forrotating the conveyer, and all exhaust conduit leading from the end ofthe device opposite that to which the hopper is connected.

2. In a device of the class described, an elongated mixing chamber, aconduit con nected to one end thereof, aI hopper opening into theconduit, a tubular conveyer in said conduit and mixing chamber, saidconveyer having a worm in the conduitand being perforatedrin the` mixingchamber, teeth overlapping the respective pcrforations in the conveyer,said teeth being directed ontwardly toward the exhaust end of the mixingchamber.

3. In a device as described in claim l, the

combination with the mixing chamber of an air chamber surrounding thesame, the wall between; the air chamber and mixing chamber beingperforated, and means for supplying the air chamber with air underpresd. In a device of the class described, a mixing chamber having anoutlet at one end thereof, a conduit connected tothe other end thereof,a. hopper communicating with the conduit, a hollow conveyer in theconduit extending into the mixing chamber, a, screw on the conveyer,means for rotating the conveyor, said conveyer being perforated withinthe mixing chamber, the perforations being inclined toward the outlet ofsaid chamber, teeth overlying the respective perforations and directlyoutwardly and toward the exhaust end of the chamber, the wall of themixing chamber being perforated, an air chamber surrounding theperforated portion of the Wall of the mixing chamber, and means forsupplying the air chamber with air under pressure.

ALONZO e. xrNYoN. i

